Chevrolet Low Cab Forward 2023 Manual page 155

154 Driving and Operating
Avoid contamination from using dirty
funnel for filling.
If a fluid other than the specified DEF is
mistakenly added, incorrect fluid may
cause a failure. Have it inspected and
serviced at a dealer immediately.
Ammonia odor may be generated when
the DEF is exposed to high temperature.
Do not overfill the DEF tank. If the DEF
tank is overfilled, DEF may leak from the
breather hose while driving. Also, if you
overfill the DEF tank in cold weather, the
DEF may freeze and damage the DEF tank
and/or its sensors.
Do not put your feet on or stand on the
DEF tank. The tank, pipe or sensors may
be damaged.
After stopping the engine, a flow sound
may be heard from the DEF tank or DEF
supply pump. This sound occurs as the
DEF in the piping is returning to the tank,
and does not indicate an abnormality.
See Selective Catalytic Reduction (SCR)
System , Adding DEF in Cold Weather ,
When DEF Freezes , and When the Diesel
Exhaust Fluid (DEF) Tank is Empty later in
this section. See Winter Driving 0 119.
Adding DEF
1. Turn the engine control switch to the
ACC or LOCK position and make sure to
stop the engine.
2. Wipe off dust or dirt from around the
filler port of the DEF tank.
3. Turn and remove the filler cap.
4. Insert the DEF nozzle into the tank and
refill until the DEF nozzle automatically
shuts off. If the nozzle shut off is not
functional, stop refilling when the DEF is
approximately 25 mm (1 in) below
bottom of the filler port.
5. Tighten the cap after refilling is
completed.
6. Wipe off DEF that is spilled at refilling.
Warning
On occasion, you may notice an odor
when the DEF tank is opened. Do not
sniff the filler port, etc.
When refilling the DEF tank: Failure to
follow the above instructions could result
in a fire or a breakdown of the selective
catalytic reduction (SCR) system.
Do not dilute DEF with water.
Do not add substances such as gasoline
or diesel fuel to the DEF tank. You and
others could be seriously injured.
Caution
When opening the DEF tank cap, be
careful not to let dirt or other foreign
matter enter inside the DEF tank.
Intrusion of foreign matter can cause a
clogging of the filter or affect the quality
of DEF, which may result in a SCR system
failure.
If DEF is spilled on the body or frame, it
may cause generation of rust, so wipe it
off and then rinse it away with water.